I run WP 4.9.7 with ACP Pro (Developer Licence) 5.7.1.
I have exactly the same problem: I cannot save a page!
The only way I found to edit a page is:
1. Pass the page from Public state to Draft, with the quick editing function.
2. Modify the page and save as a draft.
3. Pass the page from Draft state to Public, with the quick editing function.
When I unactivate ACF Pro 5.7.1 in extension list, this bug is away. So I would like to know where can I donwload the latest previous 5.6.x package of ACF Pro, to fix my website as soon as possible.
Thank you a lot.
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